/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.jmeter.visualizers;

import java.awt.BorderLayout;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;

import javax.swing.border.Border;
import javax.swing.border.EmptyBorder;

import org.apache.jmeter.samplers.Clearable;
import org.apache.jmeter.samplers.SampleResult;
import org.apache.jmeter.util.JMeterUtils;
import org.apache.jmeter.visualizers.gui.AbstractVisualizer;
import org.apache.jorphan.logging.LoggingManager;
import org.apache.log.Logger;

/**
 * For performance reasons, I am using tabs for the visualizers. Since a
 * visualizer is heavy weight, I don not want to have two separate result
 * collectors rather the same information. Instead, I would rather have the
 * visualizer be the container for the data and simply pass the data to child
 * JComponents. In the future, we may want to add email alerts as a third tab.
 */
public class MonitorHealthVisualizer extends AbstractVisualizer implements ImageVisualizer, ItemListener,
		GraphListener, Clearable {
	private MonitorTabPane TABPANE;

	private MonitorHealthPanel HEALTHPANE;

	private MonitorPerformancePanel PERFPANE;

	private MonitorAccumModel MODEL;

	private MonitorGraph GRAPH;

	public static final String BUFFER = "monitor.buffer.size"; // $NON-NLS-1$

	private static final Logger log = LoggingManager.getLoggerForClass();

	/**
	 * Constructor for the GraphVisualizer object.
	 */
	public MonitorHealthVisualizer() {
		this.isStats = true;
		initModel();
		init();
	}

	private void initModel() {
		MODEL = new MonitorAccumModel();
		GRAPH = new MonitorGraph(MODEL);
		MODEL.setBufferSize(JMeterUtils.getPropDefault(BUFFER, 800));
	}

	public String getLabelResource() {
		return "monitor_health_title"; // $NON-NLS-1$
	}

	/**
	 * Because of the unique requirements of a monitor We have to handle the
	 * results differently than normal GUI components. A monitor should be able
	 * to run for a very long time without eating up all the memory.
	 */
	public void add(SampleResult res) {
		MODEL.addSample(res);
		try {
			collector.recordStats(this.MODEL.getLastSample().cloneMonitorStats());
		} catch (Exception e) {
			// for now just swallow the exception
			log.debug("StatsModel was null", e);
		}
	}

	public Image getImage() {
		Image result = GRAPH.createImage(this.getWidth(), this.getHeight());
		Graphics image = result.getGraphics();
		GRAPH.paintComponent(image);
		return result;
	}

	public void itemStateChanged(ItemEvent e) {
	}

	public synchronized void updateGui() {
		this.repaint();
	}

	public synchronized void updateGui(Sample s) {
		this.repaint();
	}

	/**
	 * Initialize the GUI.
	 */
	private void init() {
		this.setLayout(new BorderLayout());

		// MAIN PANEL
		Border margin = new EmptyBorder(10, 10, 5, 10);
		this.setBorder(margin);

		// Add the main panel and the graph
		this.add(this.makeTitlePanel(), BorderLayout.NORTH);
		this.createTabs();
	}

	private void createTabs() {
		TABPANE = new MonitorTabPane();
		createHealthPane(TABPANE);
		createPerformancePane(TABPANE);
		this.add(TABPANE, BorderLayout.CENTER);
	}

	/**
	 * Create the JPanel
	 * 
	 * @param pane
	 */
	private void createHealthPane(MonitorTabPane pane) {
		HEALTHPANE = new MonitorHealthPanel(MODEL);
		pane.addTab(JMeterUtils.getResString("monitor_health_tab_title"), HEALTHPANE); // $NON-NLS-1$
	}

	/**
	 * Create the JSplitPane for the performance history
	 * 
	 * @param pane
	 */
	private void createPerformancePane(MonitorTabPane pane) {
		PERFPANE = new MonitorPerformancePanel(MODEL, GRAPH);
		pane.addTab(JMeterUtils.getResString("monitor_performance_tab_title"), PERFPANE); // $NON-NLS-1$
	}

	/**
	 * Clears the MonitorAccumModel.
	 */
	public void clearData() {
		this.MODEL.clearData();
		this.HEALTHPANE.clearData();
		this.PERFPANE.clearData();
	}

}
